People wait in line at a mall to get inside an H-E-B supermarket in Round Rock, Texas, on February 16, 2021. - Millions were left without power as a deadly winter storm gripped the southern and central United States Tuesday. Arctic conditions have brought record low temperatures to several states unaccustomed to -- and ill prepared for -- such extreme cold. Hardest hit was Texas, where freezing conditions prompted utility companies to implement rotating blackouts to stop the power grid being overloaded by the surge in demand. (Photo by Suzanne CORDEIRO / AFP)